Eagle Syndrome: Symptoms, Causes, Diagnosis and Treatment Options

Eagle Syndrome is a condition that causes various complaints in the neck and head region, resulting from the abnormal elongation or calcification of the styloid process (an extension of the hyoid bone). This syndrome occurs when the styloid process puts pressure on the surrounding nerve and vascular structures. In medical literature, it is also referred to as “Styloid Process Syndrome” or “Stylohyoid Syndrome,” but it is more commonly known as “Eagle Syndrome” among the public.

This syndrome takes its name from the American ear, nose, and throat specialist Dr. Watt W. Eagle, who first described it in 1937. Dr. Eagle was the first physician to systematically define the symptoms caused by an elongated styloid process.

What Are the Symptoms of Eagle Syndrome?

The symptoms of Eagle Syndrome vary depending on the length of the styloid process and which anatomical structures it compresses. Patients usually consult a doctor with the following complaints:

• Throat pain: A sharp or dull pain felt on one side of the throat, especially worsening during swallowing
• Facial pain: Pain spreading to the jaw, in front of the ear, or one side of the face, sometimes confused with toothache
• Dizziness: Balance problems triggered especially by certain head positions
• Difficulty swallowing (dysphagia): A sensation of food getting stuck or pricking while swallowing solid foods
• Ear pain: Pain radiating to the ear, sometimes accompanied by hearing problems

These symptoms can seriously affect patients’ quality of daily life. Even basic activities such as eating and speaking may become painful and restrict social life.

So, how do these symptoms occur and what does a patient experience during the process? A typical Eagle Syndrome patient usually initially feels a vague throat discomfort. Over time, this discomfort turns into a more pronounced pain. Patients often describe it as “it feels like something is stuck in my throat” or “there is a constant pricking sensation on one side of my throat.” Head movements, especially turning or extending the head, may trigger or worsen the pain. Some patients report that the pain increases while eating or yawning.

The severity of symptoms can vary greatly from patient to patient. While some experience mild discomfort, others may have severe pain that significantly affects daily life. Additionally, symptoms may be continuous or occur intermittently.

Causes and Risk Factors of Eagle Syndrome

Factors contributing to the development of Eagle Syndrome include:

Anatomical causes:

• Abnormal elongation of the styloid process: The styloid process, which normally measures 2–3 cm, being longer than 3 cm
• Calcification of the stylohyoid ligament: Calcification of the ligament between the styloid process and the hyoid bone
• Abnormal angulation of the styloid process: The process extending in a different direction from its normal anatomical position

Risk factors:

• Advanced age: The risk of calcification increases with aging
• Neck trauma: It may occur especially after surgical procedures such as tonsillectomy
• Menopause: Hormonal changes may accelerate the calcification process

The mechanism of Eagle Syndrome is based on the elongated styloid process compressing the surrounding sensitive structures. Especially when the glossopharyngeal nerve (9th cranial nerve), vagus nerve (10th cranial nerve), or sympathetic nerve fibers are affected, characteristic pain and other symptoms occur. Additionally, the elongated styloid process may compress important vessels such as the carotid artery, which can lead to symptoms like dizziness and syncope (fainting).

How Is Eagle Syndrome Diagnosed?

The diagnosis of Eagle Syndrome is made through a combination of the patient’s complaints, physical examination findings, and imaging methods. The diagnostic process can often be long and complex, as the symptoms may mimic many other head and neck diseases.

The diagnostic stages proceed as follows:

1. Detailed medical history: Information is gathered about the onset, duration, severity, and triggering factors of the patient’s complaints
2. Physical examination: During throat examination, the tonsillar fossa (tonsil bed) is palpated to check whether pain is triggered
3. Imaging methods: Panoramic X-ray, computed tomography (CT), or 3D CT is used to evaluate the length and position of the styloid process
4. Cerebral Venous Manometry: This is a pressure measurement procedure performed via angiography in the neck veins to determine whether the findings detected in imaging are truly significant and whether the planned surgery will be beneficial.
5. Differential diagnosis: Diseases with similar symptoms such as temporomandibular joint disorders, trigeminal neuralgia, and glossopharyngeal neuralgia are ruled out

During physical examination, the physician usually presses their finger into the patient’s throat at the tonsillar fossa region. In patients with Eagle Syndrome, this maneuver triggers pain similar to the patient’s complaints. This is an important clue for diagnosis.

Imaging methods are the gold standard in diagnosis. Panoramic X-ray is the first preferred method to evaluate the length of the styloid process. However, 3D CT provides a more detailed view of the length, angle, and relationship of the process with surrounding tissues. A styloid process longer than 3 cm supports the diagnosis of Eagle Syndrome, but it should be noted that although approximately 4% of the population has an elongated styloid process, most of them are asymptomatic (show no symptoms).

Treatment Methods for Eagle Syndrome

Treatment of Eagle Syndrome may be conservative (non-surgical) or surgical, depending on the severity of the patient’s symptoms and their impact on quality of life. The treatment plan should be individualized for each patient.

Conservative (Non-Surgical) Treatment Options:

• Medication therapy: Pain relievers, muscle relaxants, or anti-inflammatory drugs may alleviate symptoms
• Physical therapy: Neck muscle strengthening and stretching exercises, posture correction studies
• Injection therapies: Blocking the painful area with local anesthetics or steroid injections
• Other conservative methods: Heat application, soft diet, stress management techniques

Surgical Treatment:

In severe cases that do not respond to conservative treatment, surgical treatment may be considered. Surgery usually involves shortening or completely removing the elongated styloid process. This procedure can be performed using two different approaches: intraoral (through the mouth) or external (through the neck).

Potential risks of surgical treatment include infection, bleeding, damage to surrounding nerves, and temporary or permanent swallowing difficulties. Additionally, the formation of scar tissue after surgery may also lead to new pain.

Treatment success rates vary. Conservative treatments usually provide temporary relief, but the likelihood of symptom recurrence is high. The success rate of surgical treatment is approximately 80–90%. However, since each patient’s anatomy and symptoms are different, treatment outcomes may also vary from person to person.

Conclusion

Eagle Syndrome is a condition that is difficult to diagnose but can be managed with appropriate treatment. If you have long-standing throat, facial, or ear pain that increases especially with head turning or swallowing, and no clear diagnosis has been made despite multiple doctor visits, Eagle Syndrome should be considered. With correct diagnosis and treatment, patients’ quality of life can be significantly improved.

Frequently Asked Questions

Prof. Dr. Özgür KILIÇKESMEZ

Prof. Dr. Özgür Kılıçkesmez is one of Türkiye’s leading interventional radiology and neuroradiology specialists, focusing on minimally invasive endovascular treatments. His primary areas of expertise include aneurysm and stroke treatments, embolization procedures, non-surgical treatments of thyroid and parathyroid diseases, interventional oncology, and peripheral vascular interventions. He currently serves as the Head of the Interventional Radiology and Neuroradiology Department at Istanbul Memorial Göztepe Hospital.
Graduating from Istanbul University Cerrahpaşa Faculty of Medicine in 1997, Prof. Dr. Kılıçkesmez received advanced training in interventional radiology and oncology as a Clinical Fellow at London Guy’s & St Thomas’ and King’s College Hospital between 2012 and 2013. He earned the title of Professor in 2020 and, in the same year, became the Founding Interventional Radiologist at SBÜ Çam and Sakura City Hospital. He also holds the EBIR (European Board of Interventional Radiology) certification.
Prof. Dr. Kılıçkesmez has 94 international and 40 national publications and over 2500 citations. He serves as a reviewer for prestigious journals such as the American Journal of Roentgenology (AJR) and Diagnostic & Interventional Radiology. With his clinical and academic expertise, he is a nationally and internationally recognized authority in stroke treatment, brain aneurysm, embolization, tumor ablation, and minimally invasive treatments of thyroid/parathyroid diseases.